Inconsistent 49ers face must-win against Seattle

SANTA CLARA, Calif.  Mike Singletary tries to block out the speculation about his uncertain future with San Francisco, insisting he refuses to read newspapers or other reports and that he knows full well what could ultimately happen in a matter of a month.

His 49ers (4-8) might be mathematically eliminated from playoff contention if they lose at home Sunday to NFC West rival Seattle.

Singletary said Monday he is undecided on his starting quarterback - Alex Smith or Troy Smith - for the must-win game with the Seahawks, who thoroughly shocked once-favored San Francisco 31-6 in Week 1.

Troy Smith has started the past five games in this season of constant change for the Niners, but Singletary was contemplating another switch on the heels of Sunday's 34-16 beating at Green Bay.